Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a5cf4fa57d32cb…

MALICIOUS

PDF

78.1 KB Created: 2021-08-10 07:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d9fdaf7f19385e93eab236e9389d683 SHA-1: d6191dca3e280f9e4a3b4b3c9f4b226b57372653 SHA-256: 48a5cf4fa57d32cbd0e9f8e3b5c63f01292023689cd7e9e8e931e458a0f69e8d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4958

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://architects-desk.com/uploadsfile/16906506510.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c434721a856661d0aaf8b0689d2852f7/maguketive.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/6949781299.pdfIn PDF document text
    • https://citytrafik.nu/images/file/fejizofajaxe.pdfIn PDF document text
    • http://freeski.hu/freeski/file/falujavotip.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce2e61e5ef4e262e511143fc750d6703/muvuregilup.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/85352677781.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7745ff0b3a---gibope.pdfIn PDF document text
    • https://agatanorek.com/files/file/55916794570.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050318565973499.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/68434379037.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/41227637409.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/vevatabutixanuw.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/igv1k5dfviktif4u0slv0fu39h/73958098252.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc67497db---3326405578.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/sezakojumubufamadijele.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa86335174---1291974614.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/dukozakobaritorig.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/wimaxi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b41c34f9fe98415b42425db9ef134f46/xasojenewarekununerubiw.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/gaposi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/9509a37af11c4c3c06791e25ec2f9d4f/bewazepegigibuzu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafc20cbe---bizijafajujamasototejuni.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/bixaxajopamixajujomilon.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/90177945682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+look+up+amber+alertsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10628 bytes
SHA-256: 25f6276517d44fae51df84dbc4e5537704fb6b8000a89c79256cc93ecc7b07c9